Final answer:
The statement is false; the fetal heart features an opening called the foramen ovale, not the foramen magnum, which is an opening in the skull.
Step-by-step explanation:
The statement that the fetal heart has an orifice within the atrial septum called the foramen magnum is false. The correct name for the opening in the fetal heart that allows blood to pass between the right and left atria is the foramen ovale. The foramen magnum, on the other hand, is a large opening at the base of the skull through which the spinal cord passes. It is not related to the heart at all.